title: Authors' reply.
authors.affiliation: Department of Radiodiagnosis, All India Institute of Medical Sciences (A.I.I.M.S.), Ansari Nagar, New Delhi, India E-mail: raju152@yahoo.com.
authors.forename: Ankur
authors.initials: A
authors.lastname: Goyal
authors.forename: Raju
authors.initials: R
authors.lastname: Sharma
authors.forename: Ashu S
authors.initials: AS
authors.lastname: Bhalla
authors.forename: Shivanand
authors.initials: S
authors.lastname: Gamanagatti
authors.forename: Amlesh
authors.initials: A
authors.lastname: Seth